الفهرس 
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Abstract
Epoxy matrix was reinforced with different micro-sized ceramic particles of alumina (Al2O3), silicon carbide (SiC), and graphite with different volume fractions. The PMCs were prepared by using the mechanical stirring method. The particulates having average size of 15-30 µm were added to the epoxy matrix by 10, 20, and 30% by volume. A number of nine composites were produced as well as the pure matrix. Density, microstructure, hardness, compressive strength, as well as the tribological characteristic were studied. Wear tests were conducted at both dry and water lubricated sliding conditions using a pin-on-ring wear tester. Wear rate as well as the coefficient of friction were measured. Scanning electron microscope (SEM) was used to study the worn surfaces of the PMCs after wear tests. The results showed that composites of epoxy/SiC, epoxy/Al2O3, and epoxy/graphite have higher densities than that of the pure epoxy matrix. Such increase in density was found to be proportional to the particle content in the composite. Epoxy/SiC and epoxy/ Al2O3 composites exhibited a higher compressive strength and hardness than that of the base matrix. Epoxy/ Al2O3 composites exhibited the highest wear resistance. Epoxy/graphite composites showed lower mechanical and tribological properties than other composites under investigation.